The American rock band Eagles of Death Metal performing at the Bataclan concert hall in Paris, shortly before the attack on Friday.Credit Marion Ruszniewski/Agence France-Presse — Getty Images

The music concert industry is starting to impose new security measures after performances were canceled in Paris and throughout Europe by U2, the Foo Fighters and other acts in the aftermath of the attacks at the Bataclan concert hall in Paris.

Live Nation, the global concert giant, said on Saturday that it would increase security at its venues, and other industry representatives are expected to do the same.

“The safety and security of our shows, fans and venues continues to be our highest priority,” the company said in a statement. “Due to the recent events in Paris and in an abundance of caution we have implemented heightened security procedures globally. However, because of the sensitive nature of these protocols, we cannot elaborate further on the specific details.”

Additional security and police officers were present at a promotional event for Justin Bieber at the Staples Center in Los Angeles on Friday, Billboard magazine reported. The Staples Center is owned and managed by A.E.G. Live, a rival of Live Nation.

Among the other concerts that have been canceled or postponed in France and around Europe over the weekend were appearances by Haitus Kaiyote, Motorhead, Nekfeu, Marina Kaye, Christophe Willem and Cirque du Soleil’s “Amaluna.”

In some ways the concert business is still reeling from the fire in a nightclub in Bucharest, Romania, last month that killed 55 people.

Some in the concert industry said it was too soon to assess what the developments would mean in the long term for tours and promoters, and it was unclear what effect greater security measures would have against highly coordinated attacks like the one in Paris.

“It’s only logical for major venues worldwide to have heightened security,” said Gary Bongiovanni, editor of Pollstar, a concert industry trade magazine. “But the truth is that there is only so much anyone can do to stop a wave of suicidal attackers.”

Music stars also began to react to the killings. In an interview with the Irish radio station RTE FM2 on Saturday, Bono of U2 called the attacks “the first direct hit on music that we’ve had in this so-called war on terror.”

Madonna addressed the killings in a long statement from the stage during her concert in Stockholm on Saturday.

“In many ways, I feel torn,” she told the crowd, her voice breaking. “Why am I up here dancing and having fun when people are crying over the loss of their loved ones?

“However, that is exactly what these people want to do,” Madonna continued. “They want to shut us up. They want to silence us. And we won’t let them.”